I use and 18 rear and 20 front spring. I have about 450grams rear spring tension and small contact gap. Also I keep my needles extended from tip around .070" I have an article on machine set-up on my site: www.SanMartinTattoo.com I sell a spring gauge and feeler gauge with instructions.

I have a jonesy that is set up as a cutback...17rr,18fr, 47uf 63v, and the width of a dime....I run a 15m/17cbgpm @ 6.5v 107cps...

Thanks for the replies guys. Oh, san martin I was checking out your site, I kinda like the idea of the sticker under the a-bar, can it be any type of sticker or are you using something specific

I use label stickers that you can find at staples. I use stickers that are not too thick, so theres no interference with magnetism. Also, I have a special hole puncher that gives me perfect size circles.

thanks San Martin, I think i will give that a try, Im supper picky how my machines run, oh and I was also wanting to try those shim type things, between the coils could you use something like 2-way tape?

I don't think two-way tape would work the same as my material. The material I use is super vibration absorbent. My O Rings use this same material as well.